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ScrewRelated Patent Categories: Expanded, Threaded, Driven, Headed, Tool-deformed, Or Locked-threaded Fastener, Externally Threaded Fastener Element, E.g., Bolt, Screw, Etc., Head Driving StructureScrew description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060228189, Screw. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the priority benefit of Taiwan Patent Application Serial Number 094110796, filed Apr. 6, 2005, the full disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to a screw, and more particularly to a screw capable of generating larger driving torque. [0004] 2. Description of the Related Art [0005] Currently, conventional screws or bolts include many types of head, such as pan head, conical head, annular head, countersink head, oval head, truss head, etc., which can be adapted to drive recesses such as slot drive recess (A), cross (Phillips) drive recess (B), cross-square combination drive recess (C), square drive recess (D) and double-cross (Pozi) drive recess (E) as respectively shown in FIGS. 1, 2, 3, 4 and 5. However, hand tools which match with the above-mentioned drive recesses (A), (B), (C), (D) and (E) includes a screw driver bit having drive bits which are limited to only the types of slot, cross, cross-square combination, square and double-cross, etc. Thus, the application of the screw driver bits is restricted, such that currently other screw driver bits cannot insert into the above-mentioned drive recesses, and the screw cannot generate larger diving torque. [0006] Furthermore, according to the requirement of engagement between the drive recess and the screw driver bit, the screw driver bit must engage with the drive recess quickly, and simultaneously the loose engagement (the drive bit wobbles excessively within the drive recess) shouldn't be large after the screw driver bit is engaged with the drive recess. If the loose engagement is large, the drive recess and the drive bit of the screw driver bit will be damaged when a power-driven tool suddenly turns to generate large torque, because the engagement between the drive recess and the screw driver bit is not tight, such that the loose engagement is large and then the drive bit slips out of the drive recess. [0007] Accordingly, in order to solve the above-mentioned problem and to improve above-mentioned screw, mold and screw driver bit, Taiwan Patent Publication Number 382306, entitled "Screw, Mold and Screw Driver bit" and commonly assigned to the assignee of the present application, discloses a drive recess of screw head including four symmetrical fan-shaped grooves and a square groove formed at the center of the fan-shaped grooves. A bit portion of a mold for forging the screw and a drive bit of a screw driver bit for matching with the screw, correspondingly include four symmetrical fan-shaped protrusions and a square protrusion formed at the center of the fan-shaped protrusions. However, it is not easy to form four fan-shaped grooves, but is easy to damage the mold so as to substantially increase the cost. [0008] Accordingly, there still exists a need for a screw capable of solving the above-mentioned problem. SUMMARY OF THE INVENTION [0009] In order to tightly engage a screw driver bit with a drive recess, fan-shaped grooves of the drive recess of the screw head can be replaced with arc-shaped grooves. Also, if the angle between arc-shaped protrusions and square protrusion of the screw driver bit is small and the arc-shaped protrusions and square protrusion of the screw is nearly parallel to central line of the screw, the loose engagement (the drive bit wobbles excessively within the drive recess) can be substantially decreased and the driving torque can be comparatively increased, when compared with Taiwan Patent Publication Number 382306. Furthermore, preferably, the arc-shaped groove can have an arc span which is at least more than a half circle. Thus, the drive recess of the screw head of the present invention includes four symmetrical arc-shaped grooves and a square groove formed at the center of the arc-shaped grooves, wherein preferably the arc-shaped groove can have an arc span which is at least more than a half circle. A bit portion of a punch (mold) for forging the screw and a drive bit of a screw driver bit for matching with the screw, correspondingly include four symmetrical arc-shaped protrusions and a square protrusion formed at the center of the arc-shaped protrusions. [0010] Accordingly, it is an object of the present invention to provide a drive recess of head of screws or bolts not only applied to a variety of types of drive bit of the screw driver bit and but also matched with the structure of the screw driver bit of a hand tool result therefrom, whereby the screw can generate larger diving torque of engagement, and the drive bit of the screw driver bit can much tightly engage with the drive recess, because the drive recess includes four symmetrical arc-shaped grooves and a square groove formed at the center of the arc-shaped grooves. [0011] It is another object of the present invention to provide a punch of a screw forging device resulted from the drive recess of the screw for forging the screw head, wherein a bit portion of the punch is corresponding to the drive recess of the screw head and includes four symmetrical arc-shaped protrusions and a square protrusion formed at the center of the arc-shaped protrusions. [0012] It is a further object of the present invention to provide a structure of a screw driver bit of a hand tool resulted from the drive recess of the screw, wherein a drive bit of the screw driver bit is corresponding to the drive recess of the screw head and includes four symmetrical arc-shaped protrusions and a square protrusion formed at the center of the arc-shaped protrusions. [0013] The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0014] FIG. 1 is a top view of a slot drive recess of a first conventional screw; [0015] FIG. 2 is a top view of a cross drive recess of a second conventional screw; [0016] FIG. 3 is a top view of a cross-square drive recess of a third conventional screw; [0017] FIG. 4 is a top view of a square drive recess of a fourth conventional screw; [0018] FIG. 5 is a top view of a double-cross drive recess of a fifth conventional screw; [0019] FIG. 6 is a top view of a screw according to an embodiment of the present invention; [0020] FIG. 7 is a cross-sectional view along A-A' line of FIG. 6; [0021] FIG. 8 is a partial perspective view of a screw of the present invention; Continue reading about Screw... Full patent description for Screw Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Screw patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Screw or other areas of interest. ### Previous Patent Application: Self-drilling wall anchor device and method for using the same Next Patent Application: Tamper-resistant fastener and method and tool for use with same Industry Class: Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener ### FreshPatents.com Support Thank you for viewing the Screw patent info. 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